Test And Research On Tractive & Appendiculate Performance Of Iron Wheel With Lugs On Dry Land

It is a common phenomenon for tractors, especially small tractors, working in dry land that tractors have bad tractive and appendiculate performance and high slip which result in low tractive efficiency and high diesel consumption. For several decades, a lot of research work have been done by many scholars and experts to improve tractors tractive and appendiculate performance and many achievements have been obtained. Studying on new tracking mechanism will have theoretic and practical value for improving tractors' power and economy performance. A new iron wheel with lugs is designed on the basis of cultivating requirements, soil-vehicle mechanics, new technology and parallel four-link mechanism principle. The character of the new wheel is that lugs' angle and depth in soil may be adjusted. Comparison with the original one in construction, and analysis of the wheel's dynamics for this new iron wheel were conducted. The influence factors of the new wheel's drive and resistance were exploring, such as soil parameter, wheel configuration parameter and operation condition, which provided theory basis for the development of new iron wheel. The method of rotary experimental design was discussed in detail when it was used for the study of the optimum configuration parameter on the new wheel, which was to obtain optimum lugs angle and depth in soil. Single driven iron wheel with lugs set was used in the experiment on wheat stubble field. Based on the field experiment data, regress model on silp and lug angle and lug depth were obtained. By analyzing the regression model, some conclusions were concluded: under the certain tractive force, the slip decreases with the increasing of the Jug depth. The slip increases with the increasing of the lug angle. Optimum analysis to slip regress model was conducted and the results showed that when the drive is 1435N, the optimum lug depth is 70mm and lug angle is 76 degree, the slip is lowest at 7.88%. Moreover, the control experiment of tractive and appendiculate performance were conducted, in which the single tire, single iron wheel with lugs and the tire and iron wheel with lugs fitted together were tested and compared. Based on the experiment data, when tire fitted with iron wheel with lugs, the tractive force increases by 10.3%, the tractive power increases by 12.5% and the appendiculate coefficient enhances by 33.3%. So small tractors fitted with iron wheel with lugs can improve tractive and appendiculate performance of tractor in dry land. More study is necessary to decide whether the conclusion is suited to the other soil condition and other iron, wheels.